Are phase changes a physical change or a chemical change? Example: My icecream cone melted in the hot sun.

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

In a chemical reaction, the final amount of the products is determined by the a. universal gas law b. law of definite proportions c. air pressure d. temperature e. none of the above me

Which of the following are in a chemical family a. ca, sc, k b. cu, ag, au c. so, ge, sb